We will begin solving this problem by analyzing what information we have, to solve this problem:

**Firstly, we will need to write a balanced equation for the data provided.**

Phosphorous **P**_{4 }reacts with **Chlorine gas**** **to form **Phosphorous Pentachloride****. **

**Recall that, **__Chlorine gas - Cl _{2} exists as a diatomic molecule and the prefix -penta refers to 5 therefore, we can say that the following reaction takes place __

**P _{4 (s)} + Cl_{2 (g)} → PCl_{5 (s)}**

- Write down the number of atoms on the left side and the right side separately.
- There are
**4 P**and**2 Cl**on the left and**1 P**and**5 Cl**on the right. - Multiply
**PCl**to have an_{5 }by 4**equal number**of**P’s (4 and 4, therefore, they are equal).** **Finally,**there are**20 Cl**on the right side and**only 2**on the left. Multiply**Cl**. Now both sides have an equal number of atoms._{2 }by 10

Elemental phosphorus occurs as tetratomic molecules, P_{4}. What mass (g) of chlorine gas is needed to react completely with 455 g of phosphorus to form phosphorus pentachloride?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Stoichiometry concept. You can view video lessons to learn Stoichiometry. Or if you need more Stoichiometry practice, you can also practice Stoichiometry practice problems.

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What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.